CVE-2026-107894 in V-Sft
Summary
by MITRE • 10/26/2026
V-SFT provided by FUJI ELECTRIC CO., LTD. contains a stack-based buffer overflow vulnerability. Opening a crafted V7 file may lead to information exposure or arbitrary code execution on the affected product.
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Analysis
by VulDB Data Team • 10/26/2026
The vulnerability identified in Fuji Electric Co., Ltd.'s V-SFT software represents a critical security flaw rooted in improper memory management during the processing of specific input files. Specifically, this is classified as a stack-based buffer overflow, which corresponds to CWE-121 in the Common Weakness Enumeration taxonomy. This type of vulnerability occurs when a program writes more data to a fixed-length block of memory on the call stack than it can hold. In the context of V-SFT, the application fails to adequately validate or bound-check user-supplied input before copying it into a pre-allocated buffer located in the stack memory space. When an attacker provides a specially crafted V7 file that exceeds the expected size limits, the excess data overwrites adjacent memory locations on the stack. This overwrite can corrupt critical control data such as return addresses, saved frame pointers, or exception handling structures, thereby disrupting the normal flow of execution within the application.
The operational impact of this vulnerability is severe and multifaceted. As noted in the initial description, successful exploitation can lead to information exposure or arbitrary code execution. Information disclosure may occur if the overflow allows an attacker to read sensitive data stored in adjacent memory regions that were not intended for public access. More critically, arbitrary code execution poses a significant threat to system integrity. By carefully crafting the payload within the V7 file, an attacker can overwrite the return address with the location of malicious shellcode or use techniques like Return-Oriented Programming (ROP) to hijack control flow. This allows the attacker to execute commands at the privilege level of the vulnerable application process. If V-SFT runs with elevated privileges, this could result in full system compromise, enabling lateral movement within an industrial network and potentially disrupting critical infrastructure operations managed by Fuji Electric systems.
From a tactical perspective, this vulnerability aligns with ATT&CK techniques related to initial access and execution. The use of a crafted file suggests exploitation via drive-by or phishing-like vectors where the victim is tricked into opening the malicious V7 file. Once executed, the attacker gains code execution capabilities which can be leveraged for further persistence, privilege escalation, or data exfiltration depending on the surrounding environment's security controls. Industrial control systems often rely on legacy software that may lack modern memory protection mechanisms such as Address Space Layout Randomization (ASLR) or Data Execution Prevention (DEP), making stack-based overflows particularly dangerous in these environments where availability and integrity are paramount.
Mitigation strategies should focus primarily on applying vendor-provided patches if available, as Fuji Electric likely has released updates that address the buffer boundary checks within V-SFT. In cases where patching is not immediately feasible, network segmentation plays a crucial role in limiting exposure. Restricting access to systems running vulnerable versions of V-SFT to only trusted and authorized users can reduce the attack surface significantly. Additionally, implementing strict file type validation at the perimeter or endpoint level can prevent maliciously crafted files from reaching the vulnerable application. Organizations should also ensure that their security information and event management (SIEM) solutions are configured to detect anomalous behavior indicative of exploitation attempts, such as unusual memory access patterns or unexpected process spawns following file openings. Regular vulnerability assessments and penetration testing focused on industrial control system software are essential for maintaining a robust defense posture against such high-severity flaws.